How to find out the reason a line is highlighted when using elpy?

Question

When a line of mine is unacceptable to the default syntax/quality checker used with elpy, it underlines the line in red.

How do I find out why the lne is underlined?

Answer 1

Normally you'd have to hover over the line with your mouse.

However that's very un-emacs-y so I'd suggest using flymake-cursor so that the message appears in the mini buffer instead.